[Coco] DW and 6551

[Aaron Wolfe]

We might be talking about two different issues.  The "lose a byte on CTS"
problem can be fixed with a hack, I recall an article about that in one of
the new letters or maybe the rainbow.  But I think the max rate of the 6551
in the Tandy pak is artificially lower than other cards.  I just can't
remember why.

On Feb 10, 2015 11:33 PM, "Stephen H. Fischer" <SFischer1 at mindspring.com>
wrote:
>
> Not from what I remembered.
>
> The flaw is in the 6551 itself. See my other post.
>
> I have lots of Synertek chips, I hounded them about the 6809 CPU kit for
the 6502 SYM-1.
>
> I got SN0001!
>
> Then I had to go to Halted to get a chip for them to program to make it
work. Only a block away.
>
> Speaking of Halted, can others get their webpage to display? I still
cannot.
>
> http://www.halted.com/
>
> SHF
>
> ----- Original Message -----
> From: "Aaron Wolfe" <aawolfe at gmail.com>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Tuesday, February 10, 2015 8:12 PM
> Subject: Re: [Coco] DW and 6551
>
>
> > On Feb 10, 2015 11:00 PM, "RETRO Innovations" <go4retro at go4retro.com>
wrote:
> >>
> >> On 2/10/2015 9:26 PM, Stephen H. Fischer wrote:
> >>>
> >>> And there is the 6551 flaw if I remember correctly voids the entire
idea
> > of using it.
> >>
> >> What flaw is that?  The CBM folks use 6551s
> > all the time with no issues.
> >>
> >> JIm
> >
> > I don't know the details, but I'm pretty sure the problem is limited to
the
> > Tandy Deluxe rs232 pak.  There are other 6551 based serial cards for the
> > coco that can operate at higher speeds.  Unfortunately the Tandy card is
> > the most common.
>
>
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